LXR linux/drivers/tty/serial/cpm_uart/cpm_uart

   1/*
   2 *  Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
   3 *
   4 *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
   5 *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
   6 *
   7 *  Copyright (C) 2004 Freescale Semiconductor, Inc.
   8 *            (C) 2004 Intracom, S.A.
   9 *            (C) 2006 MontaVista Software, Inc.
  10 *              Vitaly Bordug <vbordug@ru.mvista.com>
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License as published by
  14 * the Free Software Foundation; either version 2 of the License, or
  15 * (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25 *
  26 */
  27
  28#include <linux/module.h>
  29#include <linux/tty.h>
  30#include <linux/gfp.h>
  31#include <linux/ioport.h>
  32#include <linux/init.h>
  33#include <linux/serial.h>
  34#include <linux/console.h>
  35#include <linux/sysrq.h>
  36#include <linux/device.h>
  37#include <linux/bootmem.h>
  38#include <linux/dma-mapping.h>
  39
  40#include <asm/io.h>
  41#include <asm/irq.h>
  42#include <asm/fs_pd.h>
  43
  44#include <linux/serial_core.h>
  45#include <linux/kernel.h>
  46
  47#include <linux/of.h>
  48
  49#include "cpm_uart.h"
  50
  51/**************************************************************/
  52
  53void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
  54{
  55        cpm_command(port->command, cmd);
  56}
  57
  58void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
  59                                struct device_node *np)
  60{
  61        return of_iomap(np, 1);
  62}
  63
  64void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
  65{
  66        iounmap(pram);
  67}
  68
  69/*
  70 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
  71 * receive buffer descriptors from dual port ram, and a character
  72 * buffer area from host mem. If we are allocating for the console we need
  73 * to do it from bootmem
  74 */
  75int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
  76{
  77        int dpmemsz, memsz;
  78        u8 *dp_mem;
  79        unsigned long dp_offset;
  80        u8 *mem_addr;
  81        dma_addr_t dma_addr = 0;
  82
  83        pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
  84
  85        dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
  86        dp_offset = cpm_dpalloc(dpmemsz, 8);
  87        if (IS_ERR_VALUE(dp_offset)) {
  88                printk(KERN_ERR
  89                       "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
  90                return -ENOMEM;
  91        }
  92        dp_mem = cpm_dpram_addr(dp_offset);
  93
  94        memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
  95            L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
  96        if (is_con) {
  97                /* was hostalloc but changed cause it blows away the */
  98                /* large tlb mapping when pinning the kernel area    */
  99                mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
 100                dma_addr = (u32)cpm_dpram_phys(mem_addr);
 101        } else
 102                mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
 103                                              GFP_KERNEL);
 104
 105        if (mem_addr == NULL) {
 106                cpm_dpfree(dp_offset);
 107                printk(KERN_ERR
 108                       "cpm_uart_cpm1.c: could not allocate coherent memory\n");
 109                return -ENOMEM;
 110        }
 111
 112        pinfo->dp_addr = dp_offset;
 113        pinfo->mem_addr = mem_addr;             /*  virtual address*/
 114        pinfo->dma_addr = dma_addr;             /*  physical address*/
 115        pinfo->mem_size = memsz;
 116
 117        pinfo->rx_buf = mem_addr;
 118        pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 119                                                       * pinfo->rx_fifosize);
 120
 121        pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem;
 122        pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 123
 124        return 0;
 125}
 126
 127void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 128{
 129        dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
 130                                                          pinfo->rx_fifosize) +
 131                          L1_CACHE_ALIGN(pinfo->tx_nrfifos *
 132                                         pinfo->tx_fifosize), pinfo->mem_addr,
 133                          pinfo->dma_addr);
 134
 135        cpm_dpfree(pinfo->dp_addr);
 136}
 137